For more extensive treatment, it may be useful to ask a budget request to the dentist. Then you know in advance where you stand and you can ask for an explanation unclear. You can also use this budget with your insurance ask what you are reimbursed from the planned treatment.
You will more often be faced with a budget. A budget is always an estimate. During treatment, there may be (unplanned) situations which entail costs. Thus, there are complications such fillings or still larger / smaller show. There can be no rights can be derived from the budget. The future budget is valid until a specified date. From that date expires because the budget example, rates are adjusted. Payments After the treatment you get the notes right away with a copy for your insurance. In practice it is common to use a PIN or by direct debit authorization to pay.